<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>
<script>
    const formatSeconds = (s) =>
        [parseInt(s / 60 / 60), parseInt((s / 60) % 60), parseInt(s % 60)]
            .join(':')
            .replace(/\b(\d)\b/g, '0$1')
</script>

</html>